#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#define BUF_SIZE 1024

void error_handling(char *message)
{
  fputs(message, stderr);
  fputs("\n", stderr);
  exit(1);
}

int main(int argc, char * argv[])
{
  int sock;
  char message[BUF_SIZE];
  int str_len;
  struct sockaddr_in serv_addr;

  if (argc != 3) {
    printf("Usage: %s <IP> <port> \n", argv[0]);
    exit(1);
  }

  sock = socket(PF_INET, SOCK_STREAM, 0);
  if (sock == -1)
    error_handling("socket() error!");

  memset(&serv_addr, 0, sizeof(serv_addr));
  serv_addr.sin_family = AF_INET;
  serv_addr.sin_addr.s_addr = inet_addr(argv[1]);
  serv_addr.sin_port = htons(atoi(argv[2]));

  if (connect(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) == -1)
    error_handling("connect() error!");
  else
    puts("Connected ......");

  while (1) 
  {
    fputs("Input message(Q to quit): ", stdout);
    fgets(message, BUF_SIZE, stdin);
    
    if (!strcmp(message, "q\n") || !strcmp(message, "Q\n"))
      break;

    write(sock, message, strlen(message));
    str_len = read(sock, message, BUF_SIZE-1);
    message[str_len] = 0;
    printf("Message from server: %s \n", message);
  }
  close(sock);
  return 0;
}
